CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - APCo - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities:
Depreciation and Amortization	$ 2,566.1	$ 2,461.7
Deferred Income Taxes	123.6	89.5
Allowance for Equity Funds Used During Construction	(172.9)	(153.0)
Mark-to-Market of Risk Management Contracts	(192.6)	(97.6)
Deferred Fuel Over/Under-Recovery, Net	164.7	304.6
Change in Other Noncurrent Assets	(719.7)	(244.0)
Change in Other Noncurrent Liabilities	133.8	193.8
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	(212.4)	(131.8)
Fuel, Materials and Supplies	150.7	188.5
Accounts Payable	327.3	14.2
Accrued Taxes, Net	(687.2)	(532.3)
Other Current Assets	37.7	(139.2)
Other Current Liabilities	74.3	161.8
Net Cash Flows from Operating Activities	5,130.8	5,076.9
INVESTING ACTIVITIES
Construction Expenditures	(6,001.2)	(5,168.6)
Other Investing Activities	43.5	73.0
Net Cash Flows Used for Investing Activities	(7,749.1)	(4,769.5)
FINANCING ACTIVITIES
Issuance of Long-term Debt	6,249.2	3,748.5
Retirement of Long-term Debt	(2,803.8)	(1,969.1)
Principal Payments for Finance Lease Obligations	(37.9)	(51.2)
Dividends Paid on Common Stock	(1,497.9)	(1,402.7)
Other Financing Activities	2.8	(50.4)
Net Cash Flows from (Used for) Financing Activities	3,479.1	(387.2)
Net Increase in Cash and Cash Equivalents	860.8	(79.8)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	246.0	379.0
Cash, Cash Equivalents and Restricted Cash at End of Period	1,106.8	299.2
SUPPLEMENTARY INFORMATION
Cash Paid for Interest, Net of Capitalized Amounts	1,315.1	1,247.3
Net Cash Paid for Income Taxes	60.1	87.9
Cash Paid (Received) for Transferable Tax Credits	(102.2)	(163.7)
Noncash Acquisitions Under Finance Leases	30.0	24.5
Construction Expenditures Included in Current Liabilities as of September 30,	1,168.8	1,015.1
APCo
OPERATING ACTIVITIES
Net Income	352.6	304.6
Adjustments to Reconcile Net Income to Net Cash Flows from Operating Activities:
Depreciation and Amortization	485.6	444.5
Deferred Income Taxes	24.7	(23.0)
Allowance for Equity Funds Used During Construction	(12.8)	(11.4)
Mark-to-Market of Risk Management Contracts	(56.5)	(33.6)
Deferred Fuel Over/Under-Recovery, Net	68.2	124.1
Change in Regulatory Assets	(153.4)	(16.1)
Change in Other Noncurrent Assets	32.5	3.0
Change in Other Noncurrent Liabilities	25.4	5.6
Changes in Certain Components of Working Capital:
Accounts Receivable, Net	29.0	3.6
Fuel, Materials and Supplies	36.8	62.2
Accounts Payable	29.2	50.4
Accrued Taxes, Net	(80.1)	12.8
Other Current Assets	15.5	(24.7)
Other Current Liabilities	11.9	34.8
Net Cash Flows from Operating Activities	808.6	936.8
INVESTING ACTIVITIES
Construction Expenditures	(748.5)	(708.7)
Change in Advances to Affiliates, Net	(31.9)	0.0
Other Investing Activities	12.8	14.4
Net Cash Flows Used for Investing Activities	(767.6)	(694.3)
FINANCING ACTIVITIES
Capital Contribution from Parent	8.5	109.5
Return of Capital to Parent	0.0	(4.5)
Issuance of Long-term Debt	593.2	480.8
Change in Advances from Affiliates, Net	(95.0)	(338.7)
Retirement of Long-term Debt	(498.3)	(413.5)
Principal Payments for Finance Lease Obligations	(6.4)	(6.5)
Dividends Paid on Common Stock	(50.0)	(75.0)
Other Financing Activities	1.6	0.3
Net Cash Flows from (Used for) Financing Activities	(46.4)	(247.6)
Net Increase in Cash and Cash Equivalents	(5.4)	(5.1)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	20.1	19.9
Cash, Cash Equivalents and Restricted Cash at End of Period	14.7	14.8
SUPPLEMENTARY INFORMATION
Cash Paid for Interest, Net of Capitalized Amounts	172.4	159.6
Net Cash Paid for Income Taxes	76.4	27.4
Cash Paid (Received) for Transferable Tax Credits	0.0	(0.2)
Noncash Acquisitions Under Finance Leases	2.5	0.9
Construction Expenditures Included in Current Liabilities as of September 30,	$ 128.6	$ 129.9